The invention provides a pharmaceutical formulation which comprises, in accordance with the invention, hypericin or a hypericin derivative in solution in an alcohol, optionally basic salt, especially sodium salt, and a solubilizer. The formulation is anhydrous. The invention provides hypericin stably in solution and enables preparation of an aqueous infusion solution with which hypericin can be administered intravenously in dissolved form. The invention further relates to a process for preparing the pharmaceutical formulation and to an infusion solution comprising the pharmaceutical formulation.